Safety-valve mechanism for pneumatic tires.



, w. MgMYERS. SAFETY VALVE MECHANISM .FOR PNEUMATIC TIRES.

- APPLICATION FILED JULY 20, 19M.

1,136,901, Patented Apr. 20, 1915.

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s'ra rns PAT mor ;wInLrAM M. MYERS, or $1 JOSEPH, Missouri;

sArErY-vALvE MECHANISM roe PNEUMATIC TIRES.

To all whom it may concern:

Be it known that I, l VILLIAM M. MYERS, a citizen of the United States, residing at St. Joseph, in the count-y of Buchanan and 5 State of Missouri, have invented certain new v and useful Improvements in Safety-Valve Mechanisms for Pneumatic Tires, of which the following isa'specification.

, My invention relates to improvements in safety valve mechamsms for pneumatic tlres.

The object of my invention is to provide novel means by which when the pressure in' a pneumatic tire reaches a. pre-determined amount, some of the all will be discharged to the atmosphere so as to prevent damage to the tire;

My invention provides further novel safety valve mechanism whichperrnits of the'tire being pumped up without disturb- 2Q ing the operation of the safety valve mechanism,thereby eliminating danger of burst-f ing the tire during the filling Operation.

My invention provides still further novel meansof adjustment by which the 'mechanism may be set to operate at differentpressures.

My invention provides still further novel indicating mechanism by which the tire pressure may be ascertained at a glance.

My invention further provides a novel Other features of my invention are hereillustrate the preferred embodiment of my invention,.Figure l is'an enlargedvertical 40 sectional view of my improved. safety valve mechanism shown mounted on an'ordinary tire filling tube, shown partly in elevation and partly in vertical section. Fig.2 is a reduced elevation View of' my improved *safety valve mechanism, the closure for the pressure indicator being shown in the open position." Fig. 3. iSIEt cross section on the 1 broken line 33 of Fig; 1, the coilspring on' the plunger being omitted. Fig. 4 is afrag 5dmental .vertical sectional view on theplane".

of the line ,44 of Fig. 3. Fig. 5-is a view partly: in side elevation, partly inwertial section and partly broken away, of my improved valvemechanism, .the 'cap' being removed.

I v Specification of Letters Patent. Application'filed Ju1y 20, 1914. Serial No. 851,878.

Patented A r. 20, 1915.

Similar reference characters designates similar parts 1n the ,diii'erentiviewsf 1 designates a portion of an ordinary inflatable tire, and 2 a portion of the rim on which the tire is mounted.v

3 designates the ordinary filling tube attached to the tire 1 and having aninternally and an externally screw-threaded upperend.

My improved valve mechanism is' adapted to be secured to theordinary filling tube 3 and comprises the following described parts: 4 designates the valve casing having at its lower end an annular flange 5 on which rests a gasket 6, which is mounted in an inner annular groove 7 provided in the upper end of an internally threaded coupling 8, which is fitted on the upper end of the tube 3 and which bears against a nut 9 mounted onthe tube 3 and bearing against the rim 2. The lower end of the casing 4 beats against a gasket 10 which rests upon the upper end of the tube 3. Lengthwise through the valve casing 41: is an air inlet passage 11, the lower end of which communicates with the interior of the tube 3 by way of'a lateral opening 13 provided in a vertical tube 12 which is secured in the lower end ofthepassage 11. Secured in the tube 12 is a block 14 having vertical peripheral grooves 15','which permits the air to pass fromthetube 3 into the passage 11. The blocks 14 is adapted when thevalve mechanism is, in operative position, to depress the usual valve stem 16, with which the tube 3 is commonly provided. The up- I per end of.the passage 11 isadapted to communicate with the atmosphere to permit the escape'thereto of air from the tire 1. The

upper end ofthe casing 4: has a tubular e'xtension 17, which is internally screw-threaded and has fitted therein a collar 18 which bears against a valve seat member 19, which.

is mounted in and extends through arubbergasket 20, which is mounted in the lower end of the threaded portion 17." An inwardlyopening valve 21 mounted in the passage 11 below the valve seat 19 is normally held against said valve seat by means of a-coil spring 23 which encircles a stem 24 extending downwardly from the valve 21 and througha hole in the upper end of an inverted cup-shaped support 25, the lower endiof which rests against an annular shoulder/26 provided in the passage 11. The

support 25 is loosely fitted in the passage 11 I10 and has longitudinal slots 27 which serve as pounds pressure. of the air in, the: the 1.

air passages. The valve 21- is providedwith an upwardly .extendingstem 22, which-extends through the valve seat 19an d thecpl 1311118, and 'pro'jects'above the upper end or the extension l l'and is-adapted to have bear against it one end of a horizontal lever 30,

which is pivoted adjacent to its middle on ahorizontal' pin '29 which is secured in .an 'ear 28- with which the upper end of the; extension 17 is provided. The other end of the lever 30 is adapted to be raised, for the 'pu'r pose of depressing the valve 2 mains.

- of vertically movable plunger which I- ;will -:15.

hereinafter-describe. 4

Thecasing 4- is provided with a circular a screw-threaded recess 31, in which is "fitteda vertical hollow cylinder 32, 'which'rests v v sage 11 rises, the diaphragm 33; willf'rise a I .-s5--. 1 will depress thdvalveQl through inter-' \mediacy of the istem 22,1evr. 30,1111; 38

upon the upper side of a flexible diaphragm 733 preferably soft rubber, which is larger ';:;";-.'.-th'an and closes the upper end of the tube,

' 12. Reciprocatively mo'unte'd in the 'cyl-in-v- 1 181,32 i a piston 34 adapted to b raised y c the agmtl and having in its PF' end acentral screw-threadedhole in which "is fitted the screwfthreaded-l'ower end oi a.

" plunger rod '35. The piston 34 is fslidably mounted in an externally screw-threaded collar 36 which is fitted in the recess 31 and bearsagainst'the upper end of the cylinder 32, The upper end of the stem 35 is screwvthreaded and has mouiited onit aloek :s. ff; and open the-valve 21. By adjusting the nut- -37 which bears against a nut 38,

whichv is adapted to strike and lift the adlacent end of the lever so as to: depress nuts ,87and 38 vertically on the stem 35,

the'valve 21 may be opened at diflerent degr'ees of pressure of the fair in the passage. .11 and tire 1. A coil spring 39 has its upper en'd bearingagainst an externally threaded *collar 40,whieh "is vertically adj ustably fitted 4 f'in' thescrew-threaded upper end ofthejcass ing 4; The sprin'g 39 encircles the stem f and bears at its lower end against a rack 41 "(consisting 0f.a collar fitted on the stem 35- i I and" provided with annular peripheral flanges 42. spaced equal distances apart and II serving as teeth which engagew'ith theit'eeth so Ofja segmental. gear 43,- Figs. 3 and 4, which f ;is -secured to a-horizontal tubular shaft 44,

side of the casing Secure to the rock shaft 44 is a segmental ea- '48, which iujwhich is pivotally mounted on a horizontal pin'45, onevend of which is rigidly secured to faverti'cal'plate 46, which is circular and fitted in an annular recess 47 provided in one .Imeshes witha pinion 49, which issecured to 0' a horizontal rock shaft 50 rotatablyfmounted 6 v I in a bearing 51 which extends through a 1 central hole in the plate 46, To the outer J end of the shaft 50 is secured a hand orpointer 52 adapted to designate numerals which. may be provided on the outer face for the' plate- 46, said numerals de1ioti ng Y or coveringathe The plate 46 thus of dial.

face of the dial plate" 46. Against the outer also efiects the. function dial andholding it in 1 place, a tube 53 is fitted-in the recess 47 and;

bears in its innertend against the outer end of I the .collar 53. bears a" transparent plate54, which is held in place by a; spring ring 55 which is mounted in an ,-'annular groove provided in the outer-end the re- When the pressure in the tire pas against the pressure of thespringi39 and stem 35 and-piston 34,- thereby permitting an to escape from the, tire solas to-f 'preve'nt its being biirstby undue 'internalpressure, When the tire pressure lowers; the hinger, comprising the-piston 34', stem 35' ndflnut permitting the va'lve '21 to close; .1:

For the purpose of permitting I be pumped up, without at;.a11"interering the-tire to I v 38 will be loweredby'the spring 39 hereby with theo eration' of the valve mechanism alrezulyde ribe d', thevalvefcasing4 is provided with .an airpassage 58 whichcommun cates, below the valve 21 'Wlth' passage 11, and which extends upwardly therefrom a through 'aivert-ical tubular extension 59 with which the upper end of the casing 4'is pro-f I vided. The upper-end of the extension 59 is internally and externally screw-threaded and has fitted therein an externally threaded collar 60, the lower end of which bears againstia valve'seat'member 61, which is supported by and extends-through a gaskt 62, which is supported by an annular shoulder 6.3 in the lower". threaded extension-5 9. 7

portion of the An inwardly open ng valve in the pas v sage 58 isadapted to bear against'the valve seat member 61', and is normallyheld against said member by a coil spring65, which encircles a-downwardly extending stem 66 of the valve'64. The lower end of the spring '65 bears against an inverted cup shaped member 'ti7,"which is supported 'by a shoulder "68inthe. passage 58',f-below' the valve 64.

The member (i7 is provided with longitudi- .nal' slots 69, which serve as-air'passa'ges, the member 67 being lloosely fitted in the passage 58.- The-lower end of the stem 66 1.25.

is slidably mounted-in a central hole in. the top of the member 67; The valve .64 is pro ber 61 and collar 60. i

' vided with an upwardly extending stem 70 which extends through the valve seat mem-" to the externally of the casing 4;

., vice may'jbe arranged to open the valve 21 at any desired pressure, the pressure of the sprin'g39 being-adjustable by vertical ad'-' In filling the I tire, the usual coupling, not

showmwith which the pump is commonly provided, is-inserted in the extension 59, thereby. depressing the valve stem 70 and valve 64, following which the filling operation is efi-iectedin the usual manner, the en- 'tering air passing through the passage 58 into the'passage l1, and thenceinto the tire.

In case the pressure rises in the tire beyond the predetermined limit for which the valve 21 r is arranged to be opened by the other 'valve operating mechanism already described, the plunger having the nut 38 will be lifted to a position in which the nut will swing the lever 30 so as to open the valve 21, thereby preventing the tire being burst while being-filled. The upper end of the extension 59 is adapted to discharge into a cap 71 having an outlet 72 communicating with the atmosphere, "and provided with an internally screw threaded lower end detach-ibly fittedscrew threaded upper end When the diaphragm 33 rises, "the piston 34 will lift the rack collar 41 thereby turn ing the hand or pointer 52, through the intermediacy of the segmental gear/l3, tubular shaft 44:, segmental gear 48, pinion 49 and shaft 50. p v

Byadjusting the nuts 37 and 38, the dejustment of the collar 40. I do not limit my invention to the structui'e shown and described, as modifications,-

' Within the scopeof the appended claims,

may be made without departing from the said valve, a member movable in one direction by the pressure in said passage, and

when moved a pre-determined distance, engaging said lever for opening said valve,

and yielding means for resisting movementofthe member in said directio p 2. In a valve mechanism, a valve casing having an air passage, a valve normally closing said passage, a lever for opening said valve, and means actuated by a pre-determined pressure insaid passage for swinging said lever to open said valve.

p 3; In a valve mechanism, a valve casing having an air passage, a valve normally closing said passage, alever for opening said valve, and adjustable means actuated by a predeterminedpressure in said passage for swinging said lever to open said valve.

and desire to secure by Letters Pat:

- 4:. In a valve mechanism, a valve casing n having an air passage, a valve normally closing said passage,-means adJustable vas to length and movable longitudinally iii-one direction by a pressure in said passage, yielding means for resisting movement in saiddirection of said longitudinally movable means, and a lever in the path of said longitudinally movable means and movablethereby so-as to open said valve.

5. In a valve mechanism, a valve casing having an air passage, a valve normally closing said assage, aplun'ger movable in one direction by the pressure'in said'passage, yielding means for resisting movement of the plunger in said direction, means actuated by the plunger for opening said valve, and'means actuated by said plunger for indicating the pressure in said passage. 6. In a valve mechanism, a valve casing having an air pass'agefa valve normally closing said passage, a lever for opening said valve, means actuated by the pressure insaid passage for swinging said leverto open said valve, and means actuated by said lever swinging means for indicating the pressure in said passage.

7. In avalve mechanism, a valve casing having an air passage, a valve normally closing said passage, a dial, a pointer cooperating with said dial, and 'means actuated ing said pointer'and for opening said valve.

8. In a valve mechanism, a valve casing having an air passage, a valve normally closing said: passage, a plunger movable in one direction by the pressure in said pets by the pressure in said passage for op'eratsage, yielding means for resisting movement of said plunger in said direction,

means actuated by the plunger when it has -moved in said direction a pre-determined distance for opening said valve, a; dial, indi-' eating means coiiperatingwith said dial,

and means actuated by the. plunger for operating said indicating jmeans.

In a valve mechanismya valve casing having an air passage, a' valve normallyclosing said passage, a lever 'for 'opemng said valve, a plunger including ,t'wdmembers longitudinally adjustable relative; to

each other and movable by, the pressure in," said pamage, and adapted to swing said,

lever to open said valve when' movedafpre'-' determined distance, and yielding means for resisting movement of said plunger. 1

1( Ina valve mechanism, a valve casing having an air -p assage,= a 'valvenormally closing saidpassage, a plunger including two members "having -screw-threaded-.con-" nection with eacli 'otherand movable infone direction-by a pressurein said passage, '=a lever for opening said valve. and actuated by said plunger, and yielding means for re, x; \sisting movement 'o:E-i;the plunger-in said direction. Y

'- 11. In a valve mechanism, a valve casing.

' having an air passage, a plunger movable in onevdirection by the pressure in said pas sage,-yieldi ng means for, resisting movement of the plunger in said direction, a valve normally closing said passage, means actuated by the plunger'for opening said valve,

a pivoted member, a dial, an indicator co- 0 eratingwith said dial, means actuated by t e plunger for swinging said pivoted member, and means actuated by said pivoted member. for operating saidfindicator.

'12. In-a valve mechanism, a valve casing having'a'n air passage, a plunger movable inone direction by the pressure in said passage,

yielding 'means' for resisting movement of the plunger in said direction, a valve nor- 7 and means actuated by the plunger for opening saidvalve. 13. In a valve mechanism, a.valve casing having an air passage, a valve normally closing said passage, a plunger movable in one direction by the pressure in said passage,

ylilelding means for resisting movement-of t e er', a rack carried by said plunger, a gear engaging said rack and carried by said pivoted member, a dial, an indicator 00- operating with said dial, means actuated by said plunger for opening said valve, and means actuated b said pivoted member for operatingsaid iii icator. a

14. In a valve mechanism, a valve casing l Jflunger-iirszzid direction, a pivoted.

having an air passage, aplunger movable in one direction by the pressure 1n said passage, 1

"a rack carried-by said plunger and comprising a member rotatable on said'plunger-and provided .with peripheral flanges forming rack teeth, a pointer, a pivoted member, aj gear: secured to said pivoted member and meshing with said rack, and means actuated by-s aid pivoted member for revolving said pointer.

In testimony whereof "I have signed my name to this specification inpresence of two subscribing Witnesses.

' WILLIAM M. MYERS.

Witnesses: v

WARREN D. House, E. B. Housn. 

